Introduce space between figures in chunk within R markdown

Good afternoon,

I was wondering if anyone knows an "easy" way to add some space between figures within the same chunk.

I use the following code to add several plots into one chunk. It looks ok. But the plots are a bit too close to each other. I would like to add 1, 2 rows of space in between.

{r fig.cap="TEST",fig.show="hold", out.width="40%",fig.align='center',fig.pos="H"}

Thank you!